QNAP TS-464U-4G NAS 4 HDD trays, rackmount 1U, 1 PSU. 4-core Intel Celeron N5105/N5095 up to 2.9 GHz, 4 GB RAM (1 x 4 GB) up to 16 GB (2 x 8GB), 2.5 Gigabit Ethernet x 2, 4xUSB, 1xHDMI . PCIe Gen 3 x2